|“||The Probotector is a fighting robot that was developed in top secret by a special scientific mechanized unit.||„|
|~ Super Probotector instruction booklet description|
When Konami released the NES version of the original Contra in the PAL region (Europe and Australia), they modified the game by replacing the original main characters and most of the human enemies with robotic counterparts, re-titling the game as "Probotector" (a portmanteau of "robot" and "protector"). The two new protagonists, RD008 and RC011, replaced Bill Rizer and Lance Bean, respectively. This was presumably done due to the German Federal Agency BPjM, which banned the sales of media deemed too violent for children, including "content which glorifies war", thus requiring the change to robotic characters.
In Contra 4, a Probotector appears as a secret character and received something of a canon update; Probotector units are armed recon robots specifically used in areas normally too dangerous or threatening for humans to enter, an open reference to their appearance as the protagonists of the early European Contra games. Much as was the case for Scorpion and Mad Dog in Contra 4, Probotectors canonically served alongside Bill Rizer and Lance Bean during the first Galuga Island conflict.
- RD008: Player 1 in Probotector. A gray robot who also appears as an extra character in Contra 4, simply called "Probotector" in that game. In Probotector II and Super Probotector, his color is blue.
- RC011: Player 2 in Probotector. A blue robot who appears as an extra palette swap for RD008 in Contra 4. In Probotector II and Super Probotector, his color is red.
- CX-1: Blue combat robot in Probotector (MD); he replaces Ray Poward in that version. Leader of Probotectors. A professional warrior, and weapons specialist.
- CX-2: Red combat robot in Probotector (MD); she replaces Sheena Etranzi in that version. Well experienced in guerrilla fighting. No one can beat him in jungle battle.
- CX-3: Mechanical werewolf in Probotector (MD); he replaces Brad Fang in that version. The battle leader of the Probotectors with the strongest power.
- CX-4: Small combat robot in Probotector (MD); he replaces Browny in that version. Because he was already a robot in the original version, he uses the same sprite. A swift and flexible professional in gathering and analyzing information.
- Unnamed Commander: Missions commander in Probotector (MD); he replaces Commander Doyle in that version.
- Note: Years indicate the dates the versions that include the Probotector characters were released, not the release dates of the original versions of the games.
- Probotector (NES, 1987)
- Probotector II: Return of the Evil Forces (NES, 1992)
- Probotector (GB, 1992)
- Super Probotector: Alien Rebels (SNES, 1992)
- Probotector (MD, 1994)
- Probotector 2 (GB, 1994)
- Contra 4 (NDS, 2007)
- To unlock Probotector as a playable character in Contra 4, the player is required to complete twelve challenges in "Challenge" mode.
- It's worth mentioning that Contra 4 was never released in Europe, which would make this appearance something of an oddity, as the Probotector character would be appearing in a game where he'd have no logical reason to be.
- Note: In Probotector (MD), each Probotector shares its voice clips with its respective Contra: Hard Corps human/robot counterpart.
- The European version of Contra: The Alien Wars is called Probotector 2. As such, both "Probotector" games for the Game Boy form a separate subseries.
- Browny, a miniature robot protagonist appearing in Contra: Hard Corps, and BR-W9, also a miniature robot protagonist from Contra ReBirth, bear notorious resemblances to Probotectors, likely being a nod to them but with a chibi design.
- Browny's serial number is CX-1-DA300. In the European version of the game, all the rest of the protagonists were changed to combat robots closely following Probotector-like designs; also, their names were changed as different models of the CX series (Ray to CX-1, Sheena to CX-2, Fang to CX-3, and Browny to CX-4).
- In Contra: Return, a pair of combat robot characters were introduced, called Bull and Scar, who bear a strikingly similar design to the Probotectors (most likely being reimagined/modernized versions of them), who also belong to the CX series (although in that game's alternate universe), these being CX-1-DA-1000 and CX-1-DA-2000, respectively.
- In Contra 4, there's an enemy called Proboterror. Fittingly enough, they are Probotector units that have been corrupted and altered by Black Viper's forces. In addition to a standard humanoid form, they can reconstitute themselves if destroyed, adopting the form of either a dog-like recon robot or an armed combat walker.
- In Contra 4, the playable Probotector has three alternate colors. In addition to the standard gray RD008 color scheme, there's also a blue RC011 color scheme, a gold color scheme and a dark-purple color scheme.